Continuous bar-heat-treating furnace



1-1,.Fig. 2; and

Patented. July 1s, 1930 UNITED STATI-:s PATENT OFFICE FRANK T. COPE, OFSALEM, OHIO, ASSIGNOR TO ELECTRIC FURNACE OOMPANY,

0F SALEM, OHIO, A COIQPORATION OF OHIO CONTINUOUS Ban-HEAr-TREATINGFURNAG Application, med my s, 192s. serial No. 276,073.

y The invention relates to heat treating furnaces and more particularlyto a continuous furnace for the heating or heat treatment ofbars and thelike.

The object of the improvement is to provide a furnace inwhich elongatedbars and the like may be continuously'passed therethrough for heating orheat treatment, skidshoes be-' ing provided for carrying the barsthrough the furnace, whereby a udn-buckling carrying means is provided,and abrasion or scratching of the bars is eliminated.

The above and other objects may be accomlplished by providing spacedskid rails through the -furnace, skid shoes being slidably mounted uponthe rails and provided with means for advancing the same through thefurnace'chamber, the bars to be heated or heat treated being inserted atone end of the furnace at right angles to the rails, and

placed upon the skid shoes, means being provided at the other end of thefurnace for pushing the bars out of the furnace.

embodiment of the invention is illustrated in the accompanying drawings,in

- whichi Figure 1 is a plan sectional view of the improved furnace takensubstantially on the line Fig. 2, a vertical sectional view through thefurnace taken substantially on the line Similar numeralsA refer tosimilar parts throughout the figures of the drawings.

The furnace is indicated generally at 1, provided with suitablerefractory 1ining'2 and supported upon the beams 3. A suitablereinforcing structure of channel v'structural members, as `shown at 4,may be provided around the exterior of the. furnace in usual manner.

The furnace chamber 5 may be substantially low in height, as best shownin Fig. 2, and is of a'length and width to accommodate the bars lto beVheated or heat treated and to give them suliicienttravel through thefurnace to .accomplish the vproper treatment thereof.

The furnace may be heated by electric resistors, as illustrated in thedrawing', in which 50 casespaced piers 6 may be located upon the floorand provided at their side faces with electric resistance elements,fasshown at 7.

Theu per edges of these piers may be c'overed as y the caps 8 of heatresisting alloy or the like", and certain of the piers may carry skidrai1s-9, which may also be formed of-heat resisting alloy, and which arepreferably of Channel cross sectional shape, and have upturned flangesas best illustrated in Fig, 2.

` Supporting or bridging plates 'l0 may be supported upon the pierscarrying the skid rails and extending transversely between ad- '4 jacentrails at the feed and discharge sides of f thefurnace. These bridgingplatesv are loca-ted slightly below the level of the top of the skidshoes and serve to direct a bent bar across the next row of shoes lwhenthe baris being pushed into or out of the furnace.l Otherare ofsuliicient length to properly transversely space the bars undertreatment, 'as shown at 12. p

Referring to Fig. 1, it vwill be seen that the skid rails extendoutwardly through the entrance or charging side of the furnace, so thatthe shoes 11 may be placed thereon and moved into the furnace in unisonas by a plurality of pushers 13, all of which may be simultaneouslyoperated, )in any suitable manner, from an operating shaft 14, which maybe driven by a motor 15 through a reduction gearing or the like, asindicated generally at 16.

As each set of shoes is moved into the charg-v ing position, a bar 12,to be treated, is inserty ed endwise into the furnace and positioneduupon the shoes in the position indicated at Ain Fig. 1. p

For this purpose, a charging opening 17 1s provided in one end of thefurnace, adapted to be normally closed as. by the. door 18 to preventheat loss. This charging of the bars may be accomplished in anysuitable'manner, and as shown in Fig-1 the bar may be placed upon a rail19, located 'adjacent t-o and in alignment with the charging opening 17,and a pusher 20, operated by any suitable mechanism, may be reciprocatedupon said rail to push the bar into the furnace, the bar being rollablyengaged by the shoes l1, to the position shown at A.

As each new set of skid shoes is placed in position upon the entranceends of the rails and moved into the furnace, all of the skid shoeswithin the furnace will be moved forwardly step'by step, thusintermittently advancing the bars under treatment toward the dischargeend of the furnace. As each bar reaches the discharge position indicatedat B, the discharge door 2l may be opened and the bar dischargedAthrough the opening 22.

This may be accomplished -by means of a i pusher 23, adapted 'to enterthe opposite side ofthe furnace, through the opening 2 4 and to beprojected entirely through the furnace, engaging the bar 12, which is inthe discharge position, and forcing thesame out through the dischargeopening Straightening rolls, pinch rolls, or other pull-out device may,if desired, be located adjacent to the discharge opening 22 for carryingthe bars away from the discharge point.

The pusher 23, the same as the pusher 20, may be reciprocatcd by anysuitable means, such as the drawbench 25, and will be returned to itsinitial position after each operation. A

In order to carry the skid shoes away from the exit side of the furnace,and return them to the entrance side thereof, the rails 11 mayextendthrough the e'Xit side of the furnace and communicate withdownwardly inclined troughs or rails 26, by means of which' the shoeswill be carried by gravity on to acon- \'eyer chain or belt 27 driven byany suitable means, such as the motor 15, and adapted to convey the skidshoes beneath the furnace and return them to the starting point.

From the above it will be obvious that the bars are rolled on to and olfof the skid shoes in charging and discharging the furnace, thusobvlat'mg scratching or abraslon of the -surfaces of the bars. As thebars remain stationary relatlve to the shoes, While the same aresuccesslvely advanced through the furnace, there is no buckling of t-hebars'during the pushing operation.

With thisform-of furnace, bars of considerable lengthma-y'beaccommodated ina furnace of comparatively, small proportions. as it isonlvrnecessary that the lengt-h of the furnace tbe sufficient-toaccommodate. the

bars, and the bars being moved transversely through the furnace,thewidth of the furnace may beonly sufficient to permit of the properduration of heating or heat treating of the bars.

Iclainu- Y l.' A bar furnace, spaced skid rails Within the furnace,cylindric skid shoes slidably and rotatably mounted upon the rails,means for charging bars longitudinally upon the shoes, means for movingthe shoes transversely through the furnace and means for discharging thebars from the shoes.

2. A bar furnace, spaced skid rails within the furnace, cylindric skidshoes slidably and rotatably mounted upon the rails, means for chargingbars.longitudinally upon the shoes, means for moving the shoestransversely Mthrough the furnace and means for discharg ing the barslongitudinally from the shoes.

3. A b ar furnace, spaced skidrails within the furnace, cylindric skidshoes slidably and rotatably mounted upon the rails, means for chargingbars longitudinally upon the shoes, means for moving the shoestransversely through the furnace, means for dischargjing the bars fromthe shoes,and means for returning the shoes to the entrance side ofthefurnace.

4. A bar furnace, spaced channel shaped skid rails within the furnacehaving uptnrned flanges, cylindric skid shoes slidablyand rotatablymounted on the channel rails for slidable movement longitudinally of thechannel rails and for rotatable movement between the ianges thereof,means for longitudinally charging bars transversely of the rails uponthe -shoes, ing the shoes longitudinally of the rails through thefurnace for moving the barsf means for slidably movtransversely throughthe furnace, and means rails within the furnace, bridging plates eX-ytending transversely between adjacent rails at the chargmg anddlschargmg sldes of the furnace, means for charging bars longitudinallyinto the furnace and positioning them upon the rails, means for movingthe bars transversely upon the rails, through the furnace, and means fordischarging the bars longitudinally from the furnace.

6. A bar furnace having a charging opening and a discharging opening,spaced skid rails within the furnace, .bridging plates extendingtransversely between adjacent rails at the. charging and dischargingsides of the furnace., the bridging plates being located slightly belowthe rails for directing a bar from one skid rail to another when beingcharged or discharged, means for charging bars longitudinally into thefurnace and positioning them upon the rails, means for moving the barstransversely upon the rails, through the furnace, and means fordischarging the bars longitudinally from the furnace.

7. A bar furnace having a charging opening and a discharging opening,spaced piers within the furnace, skid rails mounted on certain of saidpiers, bridging plates extendlevel of the top of the skid ingtransversely between adjacent rails at the chargin and dischargingsidesC of the furnace an supported' upon said piers, means for. chargingbars longitudinally into A 5 the furnace 'and positioning them upon the`rails, means for moving the ars transversely upon Athe rails, throughthe furnace, and means for discharging the bars longitudinally from thefurnace.

l0 In testimony that I claim the above,-I have hereunto subscribed myname.

FRANK T. COPE.

